Pelogenia kinbergi ( Hansen, 1882 )

Cruz-Gómez, Christopher, 2022, Pelogeniinae Chamberlin, 1919 (Annelida, Sigalionidae) from the Grand Caribbean Region, European Journal of Taxonomy 807, pp. 1-59 : 39-42

Pelogenia kinbergi ( Hansen, 1882)

Figs 2C–D, I–J , 17–18

Psammolyce kinbergi Hansen, 1882: 5 , pl. 1 figs 10–13.

Pelogenia kinbergi – Pettibone 1997: 56, figs 41–42 (syn., comb. nov.).

Material examined

GUYANA • 1 incomplete spec.; off Georgetown ; 08°28′ N, 58°12′ W; R/V Pillsbury, Stn 0694; depth 80 m; 15 Jul. 1968; UMML 6806-0694 .

Description

BODY. Pale yellow, long, broad ( Fig. 17A ); 67 segments, 4.5 cm long, 1.5 cm to segment 30, 0.5 cm wide. Middorsal line covered with coarse sand attached to adhesive papillae ( Fig. 17B ). Venter partially covered with short globular and long dendritic papillae ( Fig. 17C ).

PROSTOMIUM. Spherical. Two pairs of eyes, anterior eyes slightly larger and inserted anteroventrally ( Fig. 17D ). Lateral antennae long, slender; ceratophores longer than style, dorsally fused with tentacular segment, completely covered by median antennal ceratophore ( Fig. 17E ). Median antenna with bulbous ceratophore,twice as long as prostomium,with transverse ridges; style long, slightly shorter than ceratophore ( Fig. 17D ). Middorsal lobe of segment II absent. First segment directed anteriorly; fused with tentacular segment (left and right parapodia fused anteriorly); biramous, chaetae simple verticillate. Dorsal tentacular cirrus longer than neuropodia including chaetae, ventral tentacular cirrus as long as dorsal tentacular one, longer than neuropodia; palps short, reaching segment five, with inner palpal sheaths ( Fig. 17B ).

ELYTRA. First right elytron oval, with one large medial process, with two kinds of papillae ( Fig. 18E ): surface with flat papillae, elytral margin with pedunculate papillae with puffed tips ( Fig. 18G ). Posterior elytra oval notched, with two short medial processes, and four posterior enlarged processes, each distally expanded ( Fig. 18F ); four kinds of papillae: on the surface flat papillae, and pedunculate papillae with flat tips, concentrated along the largest process; elytral margin with pedunculate with puffed tips, and long dendritic papillae ( Figs 2C–D, I–J , 18H–I ).

RIGHT PARAPODIUM FROM SEGMENT II ( Fig. 17G ). Notopodia conical, papillate, as large as neuropodia; notopodial flange round, papillate. With up to 80 simple verticillate chaetae, tips hooked ( Fig. 17H ), shortest ones as long as notopodia, longest ones twice as long. Neuropodia truncated, short, papillate; with a truncated appendage ( Fig. 17G ). Neurochaetae only falcigers; all blades entire, slightly falcate: unit A, six falcigers with handles slender, with 19–21 transverse rows of spines, blades long, 12–13× as

.

long as wide ( Fig. 17I ); unit B, five falcigers with handles slender, with 29–31 transverse rows of spines, blades long, 13–14× as long as wide ( Fig. 17J ); units C and D undifferentiated, two falcigers with handles slender with 11–13 transverse rows of spines, blades long, 14–15× as long as wide ( Fig. 17K ).

RIGHT PARAPODIUM FROM SEGMENT III ( Fig. 17L ). Dorsal cirrophore as long as cirrostyle ( Fig. 17F ). Notopodia conical, short, smooth (non-papillate), half as long as neuropodia; notopodial flange conical, non-papillate. With up to 60 simple verticillate notochaetae, tips hooked, shortest ones as long as notopodia, longest ones twice as long ( Fig. 17M ). Neuropodia larger, conical, papillate. Neurochaetae only falcigers; units A and B with entire tips; units C and D with bifid tips: unit A, two falcigers with handles thick with 12–13 transverse rows of spines, blades medium-sized, 8 × as long as wide ( Fig. 17N ); unit B, four falcigers with handles thick with 8–12 transverse rows of spines, blades long, 9–10 × as long as wide ( Fig. 17O ); unit C, four falcigers with handles slender with 7–8 transverse rows of spines, blades long, 19–20 × as long as wide ( Fig. 17P ); unit D, two falcigers with handles slender with barely perceptible 8 transverse rows of denticles, blades long, 15 × as long as wide ( Fig. 17Q ).

RIGHT PARAPODIUM FROM SEGMENTS 21 AND 25 (MIDDLE SEGMENT) ( Figs 17R , 18A ). Notopodia conical, short, smooth (non-papillate), half as long as neuropodia; notopodial flange large, rounded. With up to 120 simple verticillate notochaetae, shortest ones twice as long as notopodia, longest ones 3 × as long ( Figs 17S , 18B ). Neuropodia larger, conical, papillate. Neurochaetae only falcigers; units A–subunit 1 with blades unidentate, falcate; unit D with bifid tips: unit A, two falcigers with handles slender with 2 rows of spines, and two subdistal rows of denticles, blades medium-sized, 4–5 × as long as ( Figs 17T , 18C ); unit B, three falcigers with handles thick with barely perceptible transverse rows of denticles, blades short, 2× as long as wide ( Figs 17U , 18C ); unit C, six falcigers with handles slender with transverse rows of denticles, blades short, 2–3 × as long as wide ( Fig. 17V ); subunit 1, one falciger with handle thick with one transverse row of spines and subdistal rows of denticles, blade massive mediumsized, 2× as long longer than wide ( Fig. 17W ); unit D, six falcigers with handles slender with transverse rows of denticles, blades long, 12–13 × as long as wide ( Figs 17X , 18D ).

POSTERIOR REGION. Lost.

Remarks

Pettibone (1997) redescribed P. kinbergi using Hansen’s (1882) description and topotype specimens. Moreover, through examination of the holotype and the original description of Eupholoe nuda Treadwell, 1936 , described from Bermuda, she concluded that this species should be regarded as its junior synonym. The specimens here examined agree with the description by Pettibone (1997), except for the proportion of the cirrophore and the style of the dorsal cirri from segment III. The specimen illustrated by Pettibone (1997: 57, fig. 41d) shows the dorsal cirri with a long cirrophore, and slightly shorter style, while the specimen here examined present the cirrophore slightly shorter than the style. The distortion of the cirrophore might be caused by fixation.

Also, intraspecific differences were noted in the elytra: the specimen here examined has a welldeveloped medial process on the first right elytron while the specimen examined by Pettibone has a barely expanded region at the same site ( Pettibone 1997: 58, fig. 42a); the examined specimen has posterior elytra with four medial processes, while Pettibone (1997: 58, fig. 42c) indicated only three. According to Pettibone (1997: 56) there is no existing type material of the species. However, Augener (1934: 123–125) redescribed the type material, originally deposited in Leiden, The Netherlands, but it might have been reidentified and placed elsewhere. Although the specific status is solved, it would be useful to confirm whether the type material is not lost.

Distribution

Grand Caribbean Region, from Florida to off João Pessoa, Brazil.

Figures

Fig. 2. Elytral microstructures. A–B, E–F, M–N. Dayipsammolyce paulayi sp. nov. C–D, I–J. Pelogenia kinbergi (Hansen, 1882). G–H. Neopsammolyce floccifera (Augener, 1906). K–L. Neopsammolyce aff. floccifera. O–P. Hartmanipsammolyce pettiboneae sp. nov. Q–R. Pelogenia capitata sp. nov. A–H. Non-adherent microestructures. A–B. Microtubercles. C–D. Pedunculate papillae with puffed tips. E–F. Short dendritic papillae. G–H. Long dendritic papillae. I–R. Adherent papillae. I–J. Flat papillae. K–L. Pedunculate papillae with flat tip. M–N. Pedunculate papillae with truncated tips. O–P. Pedunculate globular papillae. Q–R. Pedunculate capitate papillae. Scale bars: A–B, N, Q–R = 10 μm; C–F, I–M, O = 20 μm; G–H = 100 μm; P = 5 μm.

Fig. 17. Pelogenia kinbergi (Hansen, 1882), non-type specimen (UMML 6806-0694). A. Incomplete worm, dorsal view. B. Anterior end, dorsal view (insert: dorsal papillae). C. Anterior end, ventral view, pharynx partially everted (insert: ventral papillae). D. Detail of median antenna ceratophore. E. Lateral antenna. F. Right dorsal cirrus form segment III. G. Right parapodium from segment II. H. Notochaeta from same. I. Unit A. J. Unit B. K. Units C and D. L. Right parapodium from segment III. M. Notochaeta from same. N. Unit A. O. Unit B. P. Unit C. Q. Unit D. R. Right parapodium from segment 21. S. Notochaeta from same. T. Unit A. U. Unit B. V. Unit C. W. Subunit 1. X. Unit D. Scale bars: A = 5 mm; B–C, F = 1 mm; D, G, L, R = 500 μm; E = 200 μm; H, M, S = 40 μm; I–K, N–Q, T–X = 50 μm

Fig. 18. Pelogenia kinbergi (Hansen, 1882), non-type specimen (UMML 6806-0694). A–D, I. SEM micrographs. A. Right parapodium from segment 25. B. Notochaetae from same. C. Units A and B. D. Unit D. E. First right elytron. F. Right posterior elytron. G. Posterior process from E. H. Margin from E. I. Surface of posterior elytron, marginal dendritic papillae and pedunculate papillae with flat tips. Abbreviations: a = anterior; p = posterior. Scale bars: A = 200 μm; B = 10 μm; C–D, I = 50 μm; E–F = 1 mm; G–H = 100 μm.