Metaverruca Pilsbry, 1916

Young, Paulo S., 2002, Revision of the Verrucidae (Crustacea, Cirripedia) from the Atlantic Ocean studied by Abel Gruvel (Travailleur and Talisman scientific expeditions), Zoosystema 24 (4), pp. 771-797 : 780-792

Genus Metaverruca Pilsbry, 1916

Metaverruca imbricata ( Gruvel, 1900) n. comb. ( Figs 8-11 )

Verruca imbricata Gruvel, 1900: 244 ; 1902: 105, pl. 5, figs 13, 14; 1903: 100; 1905: 188, fig. 187.

Verruca trisulcata – Foster & Buckeridge 1995a: 177, figs 10-12 [non Metaverruca trisulcata ( Gruvel, 1900) ].

Newmaniverruca imbricata – Young 1998a: 77.

Metaverruca sensibilis Young, 1998b: 39 , figs 26-28.

TYPE MATERIAL. — Lectotype by present designation: Expédition du Travailleur, drag. 32, 36°36’N, 9°46’W, 441 m, rc 5.3 mm ( MNHN Ci 67); paralectotypes: Expédition du Talisman , drag. 52, 28°33’N, 15°39’W, 946 m, 1 spec. rc 6.1 mm ( MNHN Ci 63); Canary Ids, 31°34’N, 12°41’W, 912 m, on Dallina septigera , 1 spec. rc 5.8 mm ( MNHN Ci 64).

OTHER MATERIAL EXAMINED. — No locality, 1 spec., rc 5.3 mm ( MNHN Ci 65).

Morocco. Expédition du Travailleur, drag. 30, 35°24’45”N, 10°19’7”W, 1205 m, on sea urchin spines, 1884, 7 spec. rc 2.6 to 5.0 mm ( MNHN Ci 69). Expédition du Talisman, 1084 m , on Neptunia sinistrosa, 1883 , 2 spec. and fragments rc 6.8 to 7.2 mm ( MNHN Ci 68) (all samples were identified by Gruvel previously but not published to my knowledge).

BALGIM stn CP90, 34°214’N, 7°236’W, 890 m, on volcanic rocks, 3 spec. rc 3.6 to 5.8 mm ( MNHN Ci 2195) ; stn CP 91, 34°223’N, 7°251’W, 948 m, unknown substrate, fragments ( MNHN Ci 2158) ; stn CP 92, 34°243’N, 7°303’W, 1182 m, on volcanic rocks, 50+ spec. rc up to 6.1 mm ( MNHN Ci 2164) ; stn CP 95, 34°240’N, 7°393’W, 1378 m, calcareous rocks, 9 spec. and fragments rc 4.0 to 4.9 mm ( MNHN Ci 2188) ; stn CP 156, 36°200’N, 7°527’W, 1135 m, unknown substrate, 1 spec. and fragments rc 2.6 mm ( MNHN Ci 2204) ; same stn, on sea urchin spines, 100+ spec. rc up to 5.5 mm ( MNHN Ci 2152); stn CP 160, 36°146’N, 8°009’W, 1350 m, on sea urchin spines, 8 spec. rc 2.5 to 6.1 mm ( MNHN Ci 2193) (all BALGIM samples were identified as V. trisulcata by Foster & Buckeridge 1995a) .

DIAGNOSIS. — Shell surface slightly undulated, not forming conspicuous longitudinal ridges. Carina and rostrum similar in size, former with two strong articular ridges and an indentated margin below. Rostrum with two well-developed articular ridges and two small ridges directed toward axial ridge of scutum. Tergum with five articular ridges, rarely only one or two developed; axial ridge prominent on both sides, and widest. Scutum with four articular ridges; axial ridge conspicuous, thin, apex curving toward tergum.

Revision of Verrucidae ( Crustacea, Cirripedia) studied by Gruvel

Mandible with three teeth. Cirrus I with anterior ramus 0.6 length of posterior. Cirrus II with anterior ramus about 0.3 length of posterior. Intermediate articles of cirrus VI with three pairs of setae on anteri- or margin. Caudal appendage four times length of protopodite.

DESCRIPTION

Shell ( Fig. 8 A-D) white, box-like, opercular valves parallel to base of wall, with growth lines projecting mostly near base of plates, slightly undulated, not forming conspicuous longitudinal

Young P. S.

ridges; basal margin thickened. Cuticle absent. Carina ( Fig. 8A, B ) and rostrum similar in size, former with two strong articular ridges and an indentated margin below, deep grooves between articular ridges, with small radius-like projection toward fixed tergum; apex truncated not projected. Rostrum ( Fig. 8A, B ) with two welldeveloped articular ridges and deep grooves between them on the rostro-carinal articulation and two small ridges directed toward axial ridge of scutum; rostrum and fixed scutum articulation with a small radius-like projection, apex incurved. Fixed tergum ( Fig. 8C ) same size as fixed scutum, both sides with well-developed alar-like projections; apex straight. Fixed scutum ( Fig. 8C ) with wide alar-like process directed toward rostrum and a radius-like process directed toward fixed tergum, forming two ridges, apex slightly curved toward fixed tergum; internally, with developed adductor ridge projecting downwards.

Tergum ( Fig. 8A, E ) quadrangular, with five articular ridges, rarely with one or two less developed ( Fig. 8 G-I); axial ridge prominent on both sides, and widest, second and third with similar width, fourth small and thin, and fifth marginal to occludent margin, with conspicuous depressions between them; carinal area smooth. Internally, smooth; scutal margin straight,except by convex upper portion,with series of teeth produced by growth lines along margin. Scutum ( Fig. 8A, F ) triangular, smaller than tergum; with four articular ridges; axial ridge conspicuous, thin, well-marked, second ridge widest, twice width of axial ridge, third and fourth ridges small, apex curving toward tergum. Internally with a concavity for adductor muscle conspicuous on upper portion; tergal margin undulated.

Labrum ( Fig. 9A ) with a series of about 60 teeth. Palp ( Fig. 9A ) long and thin, with few simple setae on inner margin and distal region. Mandible ( Fig. 9B ) with three teeth, distance

Revision of Verrucidae ( Crustacea, Cirripedia) studied by Gruvel

between first and second a little larger than distance between second and third, upper margin of third tooth denticulate; lower angle denticulate. Maxilla I ( Fig. 9C ) with lower part projecting; two large spines at upper angle, four small spines between upper large spines and lower projecting part, and six unpaired median and thin and six smaller spines on basal portion. Maxilla II ( Fig. 9D ) triangular, anterior margin with shallow concavity medially; covered by long simple setae, except on the shallow concavity.

Cirrus I ( Fig. 10A ) with unequal rami, anterior ramus 0.6 length of posterior, covered with several long simple setae. Cirrus II ( Fig. 10B ) with anterior ramus about 0.3 length of posterior, articles more protuberant; both rami covered by numer- ous long, simple setae and distal article of anteri- or rami with bipectinate setae. Rami of cirri III- VI equal in length ( Fig. 10D ). Setal-article ratio about 6:1. Intermediate articles of cirrus VI ( Fig. 10C ) with width 0.6 length; three pairs of setae on anterior margin, longer setae finely pinnate; two or three fine simple setae on posterior angle. Caudal appendage ( Fig. 10D ) with 22 articles, four times length of protopodite; long simple setae on antero-distal margins of articles. Penis not observed. Number of articles of cirri I-VI and caudal appendage is presented in Table 3.

REMARKS

Besides the type series, there are in the collection of MNHN several samples, which were previously

identified by Gruvel but he did not publish on these. They occurred on a wide variety of substrates: Dallina septigera (Lovén, 1846) , Neptunia sinistrosa (Deshayes, 1832) , sea urchin spines, and dead corals. Most of these specimens do not exhibit differences with the lectotype, but differences were observed: specimen comprising Ci 65 (no locality) did not possess the fifth small ridge on the tergum and the specimens from Ci 69 (drag. 30, 35°24’45”N, 10°19’7”W, 1205 m) had the number of ridges on the tergum varying from three to five and for the scutum from three to four. Therefore, this species shows some differences in the number of articular ridges on both opercular plates, these being added during growth. Externally, this species can be distinguished easily by the two large ridges on the suture zone of the rostrum and carina followed by the zigzag suture below and also by the characteristically two small ridges of the rostrum directed toward the axial ridge of scutum. Furthermore, the long caudal appendage is very conspicuous.

Foster & Buckeridge (1995a: 177) considered Verruca imbricata to be a synonym of Verruca trisulcata Gruvel, 1900 , but herein, both species are considered valid. All the material they studied should be considered as M. imbricata . The examination of these samples shows these vary greatly in shell form, which is likely related to the substrate. When on flat surfaces like rounded rocks, they are more erect with the opercular plates oblique to the base and parallel to the rostro-carinal plane; specimens growing on sea urchin spines have the shell box-like with the opercular valves parallel to the basis. The specimens with a more vertical growth have the rostrum with less developed ridges directed toward the scutum basis, sometimes even absent, but all of these have the typical rostrocarinal suture and a large number of articular ridges on the opercular valves. All the samples examined have very long caudal appendage, at least four times the protopodite length, and this is very distinct from the short caudal appendages of M. radiata and M. trisulcata .

Young (1998b: 39) described Metaverruca sensibilis from the Moroccan coast. The specimens have four ridges on the opercular plates and also the typical rostro-carinal suture. Despite the absence of the secondary ridges on the rostrum this species should be considered a synonym of M. imbricata . Metaverruca imbricata has its distribution mainly along the northern African coast but with records in the Canary and Azores islands, between depths of 441 and 1378 m ( Fig. 11 ).

Metaverruca radiata ( Gruvel, 1901) n. comb. ( Figs 11-14 )

Verruca radiata Gruvel, 1901: 262 ; 1902: 94, pl. 2, figs 19, 20; 1903: 99; 1905: 180, fig. 198. — Hoek 1907: 9.

Revision of Verrucidae ( Crustacea, Cirripedia) studied by Gruvel

Verruca radiata , sec. D – Altiverruca – Pilsbry 1916: 40.

Newmaniverruca radiata – Young 1998a: 77.

Altiverruca radiata – Buckeridge 1994: 93.

Cameraverruca radiata – Buckeridge 1994: 103.

TYPE MATERIAL. — Lectotype by present designation: Expédition du Talisman et du Travailleur, Canary Islands vicinity, rc 3.5 mm ( MNHN Ci 75); paralectotype: same locality, 1 spec. rc 3.7 mm ( MNHN Ci 75).

OTHER MATERIAL EXAMINED. — Spanish coasts. Expédition du Travailleur, drag. 3, on Liothyrina sphenoidea, 1882 , 1 disarticulated spec. ( MNHN Ci 3) (identified by Gruvel [1903]).

DIAGNOSIS. —Shell with crenulated growth lines; parietal plates with longitudinal ridges. Carina a little smaller than rostrum, the former with four articular ridges. Tergum with four articular ridges; all having the same width. Scutum with four articular ridges. Mandible with four teeth, fourth tooth strongly denticulate. Cirrus I with anterior ramus slightly longer than posterior. Cirrus II with anterior ramus about 0.6 length of posterior. Intermediate articles of cirrus VI with three pairs of setae on anterior margin. Caudal appendage 0.6 length of coxopodite.

DESCRIPTION

Shell ( Fig. 12 A-D) white, box-like, opercular valves slightly inclined toward base of wall, with crenulated growth lines projecting on all plates; parietal plates of shell with conspicuous longitudinal ridges; basal margin slightly thickened, but without calcareous base. Cuticle absent. Carina ( Fig. 12A, B ) a little smaller than rostrum, former with four articular ridges and deep grooves between them, without radius-like projection toward fixed tergum; apex blunt, slightly curved. Rostrum ( Fig. 12A, B ) with four well-developed articular ridges and deep grooves between them on the rostro-carinal articulation; rostrum and fixed scutum articulation without radius-like

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0.1 mm.

projection, apex straight, slightly projected. Fixed tergum ( Fig. 12C ) with almost the same width of fixed scutum, both sides with welldeveloped alar-like projections, and a thin articular ridge directed toward fixed scutum; apex nearly straight. Fixed scutum ( Fig. 12C ) with wide alar-like process directed toward rostrum and turning toward scutum, and a narrow radius-like process directed toward fixed tergum, apex slightly curved toward fixed tergum; internally, with developed adductor ridge projecting downwards.

Tergum ( Fig. 12A, E ) quadrangular, with four articular ridges; all ridges approximately with same width and conspicuous depression between them; axial ridge prominent on both sides; carinal area smooth. Internally, smooth; scutal mar- gin slightly concave, but with two teeth project-

ing below. Scutum ( Fig. 12A, F ) triangular, smaller than tergum; with four articular ridges; axial ridge conspicuous, thin, but only scutal side well-marked, rostral part evenly curving toward rostral side, other ridges narrow, uppermost only represented by a single tooth. Internally, with a conspicuous concavity for adductor muscle on upper portion; tergal margin nearly straight, with several projections from growth lines below, and curving at upper portion.

Labrum ( Fig. 13A ) with a series of about 40teeth. Palp ( Fig. 13A ) long and thin, with few simple setae on inner margin and distal region.

Mandible ( Fig. 13B ) with four teeth, distance between first and second twice distance between second and third, fourth tooth strongly denticu- late; lower angle denticulate, including one large tooth on upper portion. Maxilla I ( Fig. 13C ) with lower part projecting; two large spines at upper angle, three small spines between upper large spines and lower projected part, and eight unpaired intermediate and strong spines on basal portion. Maxilla II ( Fig. 13D ) nearly triangular, anterior margin with shallow concavity medially; covered by long simple setae, except in the shallow concavity.

Cirrus I ( Fig. 14A) with unequal rami, anterior ramus slightly longer than posterior, covered with several long simple setae. Cirrus II ( Fig. 14B) with anterior ramus about 0.6 length of posterior, articles more protuberant; both rami covered by numerous long, simple setae, distal articles of anterior ramus with pectinate setae. Rami of cirri III-VI equal in length. Setal-article ratio about 5:1. Intermediate articles of cirrus VI ( Fig. 14C) with width 0.5 length; three pairs of setae on anterior margin and a thin small setula between each pair, longer setae finely pinnate; one or two fine simple setae and small spinules on posterior angle. Caudal appendage ( Fig. 14D) with six or seven articles, 0.6 length of coxopodite; long simple setae on antero-distal margins of articles. Penis ( Fig. 14D) short, same length as protopodite, nude. Number of articles of cirri I-VI and caudal appendage is presented in Table 4.

REMARKS

Gruvel (1901, 1902) described only the external characters of the shell of M. radiata , and did not describe the presence of an adductor ridge on the fixed scutum. Young (1998a) tentatively included this species in the genus Newmaniverruca Young, 1998 believing it did not have an adductor ridge. Nonetheless, the presence of this adductor ridge, besides the enlargement of the shell basis, indicates this species should be included in Metaverruca .

Foster & Buckeridge (1995a, b) considered M. radiata to be a synonym of M. trisulcata ( Gruvel, 1900) , but the number of articular ridges on the tergum and scutum, the teeth of the mandible and the spine distribution of maxilla I serve to distinguish both species.

Gruvel (1903) cited this species from the coast of Spain but did not give any other information. This record was ignored by other authors including Gruvel (1905). The material examined from the Expédition du Travailleur confirms this record. Therefore, this species is known to occur from Spain to Morocco ( Fig. 11 ).

Metaverruca trisulcata ( Gruvel, 1900) ( Figs 11 ; 15-17 ) Verruca trisulcata Gruvel, 1900: 243 ; 1902: 96, pl. 5, figs 9, 10; 1905: 184, fig. 203; 1912b: 348; 1920:

49. — Hoek 1907 a: 9. — Cals & Cals-Usciati 1991: 223, fig. 2, pls 1, 2.

Verruca striata Gruvel, 1900: 244 ; 1902: 98, pl. 5, figs 5, 6, text figs 17, 18; 1905: 183, figs 186, 202. — Hoek 1907: 9. — Krüger 1940: 22. — Stubbings 1967: 25. — Young 1995: 244.

Non Verruca trisulcata – Foster & Buckeridge 1995a: 177, figs 10-12 (= Metaverruca imbricata ( Gruvel, 1900)) ; 1995b: 363, fig. 9a, b (= Gibbosaverruca nitida ( Hoek, 1883)) .

Metaverruca trisulcata – Young 1998a: 54, figs 9, 13, 14; 2001: 748.

TYPE MATERIAL. — Lectotype by present designation: Expédition du Talisman, Azores , drag. 128, 38°7’N, 29°32’W, 960-998 m, rc 6.7 mm ( MNHN Ci 79); paralectotype: Expédition du Talisman, Azores , drag. 129, no coordinates, 998 m, 1 spec. rc 6.2 mm ( MNHN Ci 66).

OTHER MATERIAL EXAMINED. — Morocco. Expédition du Talisman, Cap Spartel , 622 m, 1883, 1 spec. rc 5.8 mm ( MNHN Ci 80) (identified by Gruvel [1912b]).

Cape Verde. Expédition du Talisman , drag. 114, 16°51’N, 27°30’W, 598-633 m, 1883, 4 spec. rc 3.7 to 4.8 mm ( MNHN Ci 77) (type series of Verruca striata Gruvel, 1900 ). — Expédition du Talisman , drag. 114, Cape Verde Islands vicinity, 698 m, 1883, 16 spec. rc 3.4 to 5.0 mm ( MNHN Ci 76) (type series of Verruca striata Gruvel, 1900 , one of this herein designated as lectotype).

No locality, 4 spec. rc 4.0 to 4.3 mm ( MNHN Ci 78) (identified as V. striata by Gruvel).

DIAGNOSIS. — Shell with crenulated growth lines projecting on all plates; parietal plates of shell corrugated, forming rough longitudinal ridges. Carina and rostrum similar in size, former with four articular ridges, and one small and thin ridge above the upper articular ridge and directed toward tergum axial ridge. Tergum with three articular ridges; axial ridge slightly narrower than intermediate ridge. Scutum with three articular ridges, intermediate ridge twice width of axial ridge. Mandible with three teeth. Cirrus I with anterior ramus slightly longer than posterior. Cirrus II with anterior ramus about 0.7 length of posterior. Rami of cirri III-VI equal in length. Setal-article ratio about 4:1. Intermediate articles of cirrus VI with three pairs of setae on anterior margin. Caudal appendage 0.7 length of coxopodite.

DESCRIPTION

Shell ( Fig. 15 A-C) white, box-like, opercular valves parallel to base of wall, with crenulated growth lines projecting on all plates, better developed on the rostrum and carina; parietal plates of shell corrugated, forming rough longitudinal ridges; basal margin thickened forming a thin calcareous basis. Cuticle absent. Carina ( Fig. 15A ) and rostrum similar in size, former with four articular ridges and deep grooves between them, and one small and thin ridge above the upper articular ridge and directed toward tergum axial ridge, with small radius-like projection toward fixed tergum, forming two thin ridges; apex wellcurved and projecting. Rostrum ( Fig. 15A ) with four well-developed articular ridges and deep grooves between them on the rostro-carinal articulation; rostrum and fixed scutum articulation with a conspicuous radius-like projection, apex straight and projecting. Fixed tergum ( Fig. 15B ) same width as fixed scutum, both sides with welldeveloped alar-like projections; apex projecting backwards. Fixed scutum ( Fig. 15B ) with wide alar-like process directed toward rostrum and a radius-like process directed toward fixed tergum, apex curved toward fixed tergum; internally, with adductor ridge projecting downwards.

Tergum ( Fig. 15A, D ) quadrangular, with three articular ridges; axial ridge prominent on both sides, and slightly narrower than intermediate ridge; intermediate ridge large, with the growth lines slightly crenulated, upper ridge thin and marginal to occludent margin, with a large conspicuous depression between upper and intermediate ridges; carinal area smooth. Internally, smooth; scutal margin slightly concave. Scutum ( Fig. 15A, E ) triangular, smaller than tergum; with three articular ridges; axial ridge conspicuous, thin, but only scutal side well-marked, rostral part evenly curving to rostral side, intermediate ridge twice width of axial ridge, and third ridge as a flat upper triangular projection.

Internally with a concavity for adductor muscle conspicuous on upper portion; tergal margin nearly straight, but accentually curving at upper portion, projections from growth lines at median part of tergal margin.

Labrum ( Fig. 16A ) with a series of about 60teeth. Palp ( Fig. 16A ) long and thin, with few simple setae on inner margin and distal region.

Mandible ( Fig. 16B ) with three teeth, distance between first and second a little greater than dis-

Revision of Verrucidae ( Crustacea, Cirripedia) studied by Gruvel

tance between second and third, upper margin of third tooth denticulate; lower angle denticulate. Maxilla I ( Fig. 16C ) with lower part projecting; two large spines at upper angle, four small spines between upper large spines and lower projected part, and six unpaired intermediate and thin and six small spines on basal portion. Maxilla II ( Fig. 16D ) triangular, anterior margin with shallow concavity medially; covered by long simple setae, except on the shallow concavity.

Cirrus I ( Fig. 17A ) with unequal rami, anterior ramus slightly longer than posterior, covered with several long simple setae. Cirrus II ( Fig. 17B ) with anterior ramus about 0.7 length of posterior, articles more protuberant; both rami covered by numerous long, simple setae. Rami of cirri III-VI equal in length. Setal-article ratio about 4:1. Intermediate articles of cirrus VI ( Fig. 17C ) with width 0.6 length; three pairs of setae on anterior margin and a thin small setula between each pair, longer setae finely pinnate; two or three fine simple setae on posterior angle. Caudal appendage ( Fig. 17D ) with eight articles, 0.7 length of coxopodite; long simple setae on antero-distal margins of articles. Penis ( Fig. 17D ) short, same

Young P. S.

length as protopodite, with few thin setulae at point. Number of articles of cirri I-VI and caudal appendage is presented in Table 5.

REMARKS

The specimen from the Azores, drag. 129, no coordinates, 998 m included in the type series of Gruvel (1920) was erroneously labeled by him as V. imbricata . The examination of this specimen, and the citation of this locality in the list of material of V. trisulcata indicates that this material is from the type series of V. trisulcata . Otherwise, the specimen from drag. 128 was found, and herein is designated as the lectotype of M. trisulcata .

The specimen identified by Gruvel (1912b) from Cap Spartel, Morocco, is very similar to the lectotype in having only the longitudinal ridges more conspicuous, more articular ridges on the rostro-carinal suture (five on each side) and a fixed tergum a little narrower than the fixed scutum.

The Verruca striata described from Cape Verde Islands ( Gruvel 1900, 1902) cannot be separated from M. trisulcata by any external characters. In the two samples I dissected, both had caudal appendages with seven articles, slightly smaller than the protopodite, but longer than coxopodite. I do not consider this single difference to be sufficient to separate this species from M. trisulcata .

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view; B, specimen from stn CP 140 ( MNHN Ci 2267), rostro-carinal view. Scale bar: 2 mm.

Young (1998a) redescribed M. trisulcata based on specimens from the Azores. These specimens have the longitudinal ridges of the parietal plates very conspicuous and the characteristic small caudal appendage, with seven articles.

M. trisulcata is distributed in the region between the Azores and Gibraltar ( Fig. 11 ).

Figures

FIG. 8. — Metaverruca imbricata (Gruvel, 1900); A-F, lectotype (MNHN Ci 67); A, scuto-tergal view; B, rostro-carinal view; C, fixed- tergum and fixed-scutum views; D, rostrum-fixed-scutum view; E, tergum, internal view; F, scutum, internal view; G-I, specimen MNHN Ci 2152, tergum and scutum,showing the variation on the development of the articular ridges. Scale bars:A-F, 2 mm; G-I, 1 mm.

FIG. 9. — Metaverruca imbricata (Gruvel, 1900), lectotype; A, labrum and palp; B, mandible; C, maxilla I; D, maxilla II. Scale bar: 0.2 mm.

FIG. 10. — Metaverruca imbricata (Gruvel, 1900), lectotype; A, cirrus I; B, cirrus II; C, median article of cirrus VI; D, cirrus VI and caudal appendage. Scale bars: A, B, D, 0.5 mm; C, 0.2 mm.

FIG. 11. — Geographic distribution of Metaverruca imbricata (Gruvel, 1900) (-); M. radiata (Gruvel, 1901) (Δ) and M. trisulcata (Gruvel, 1900) (•).

FIG. 12. — Metaverruca radiata (Gruvel, 1901), lectotype; A, scuto-tergal view; B, rostro-carinal view; C, fixed-tergum and fixed-scutum views; D, rostrum-fixed-scutum view; E, tergum, internal view; F, scutum, internal view. Scale bars: A-C, E, F, 1 mm; D, 2 mm.

FIG. 13. — Metaverruca radiata (Gruvel, 1901), lectotype; A, labrum and palp; B, mandible; C, maxilla I; D, maxilla II. Scale bar:

FIG. 15. — Metaverruca trisulcata (Gruvel, 1900), lectotype; A, rostro-carinal view; B, fixed-tergum and fixed-scutum view; C, rostrum- fixed-scutum view; D, tergum, internal view; E, scutum, internal view. Scale bars: 2 mm.

FIG. 16. — Metaverruca trisulcata (Gruvel, 1900), lectotype; A, labrum and palp; B, mandible; C, maxilla I; D, maxilla II. Scale bar: 0.2 mm.

FIG. 17. — Metaverruca trisulcata (Gruvel, 1900), lectotype; A, cirrus I; B, cirrus II; C, median article of cirrus VI; D, basipodite of cirrus VI, penis and caudal appendage. Scale bars: 0.2 mm.