Prionospio cristata Foster, 1971

Delgado-Blas, Víctor Hugo, 2015, Prionospio (Polychaeta, Spionidae) from the Grand Caribbean Region, with the descriptions of five new species and a key to species recorded in the area, Zootaxa 3905 (1), pp. 69-90: 78-81

publication ID

http://dx.doi.org/10.11646/zootaxa.3905.1.4

publication LSID

lsid:zoobank.org:pub:6C454B4B-E32D-4B55-B195-32A575BCC858

persistent identifier

http://treatment.plazi.org/id/039D3B4F-8134-1244-FF3A-D84FF02AFE6A

treatment provided by

Plazi

scientific name

Prionospio cristata Foster, 1971
status

 

Prionospio cristata Foster, 1971 

Figure 4View FIGURE 4 A – L

Prionospio cristata Foster, 1971: 87  , Figs. 186–199.

Prionospio (Prionospio) cristata: Johnson, 1984  : 6.51, Figs. 6.42 a –e. Prionospio (Prionospio) cristata Maciolek, 1985: 340  –341, Fig. 4View FIGURE 4.

Material examined. GULF OF MEXICO. Veracruz: 20 July 1982, coll. FEDH, 8 specimens (ECOSUR-P 1411); Yucatan: Celestun lagoon, 20 º 48 ’ 12.2 ’’N, 90 º 24 ’ 7.5 ’’W, 0.53 m, 15.6 ‰, 26 ºC, 7.9 pH, 2.1 org. carb. BOR 2, 15 February 2008, 1 specimen (ECOSUR-P 2727). CARIBBEAN SEA. Quintana Roo: E 43, APEMEX, Yalahau, 18 January 1991, 3 specimens, coll. J. Oliva Rivera and M. Esquivel Moreno (ECOSUR-P 2728); 19 February 2001, Aventuras Beach, Quintana Roo, 20 º 15 ' 31.56 "N, 87 º 23 ' 47.50 "W, sandy beach well-sorted sand, 0.3 m, 1 specimen, coll. Leslie H. Harris, Harris, LH01- 450 (LACM-AHF Poly 6224); Aventuras Beach, coll. F. Pleijel, 18 February 2001, 5 specimens (ECOSUR-P 1414); Punta Nizuc, Cancún, Coll. V.H. Delgado Blas, 10 February 2001, 1 specimen (ECOSUR-P 1412); Santa Cecilia, coll. SISV, 4 November 1990, 1 specimen (ECOSUR-P 1413).

Description. Complete specimens, 12.0–14.0 mm long for 59–65 chaetigers, 0.4–0.5 mm wide. Incomplete specimens, 2.5 –3.0 mm long for 18–23 chaetigers, 0.3–0.5 mm wide. Color in alcohol opaque white. Prostomium subtriangular, rounded anteriorly ( Fig. 4View FIGURE 4 A), posteriorly tapered, with short, blunt caruncle extending to the middle edge of chaetiger 2 with large nuchal organs on either side ( Fig. 4View FIGURE 4 A). Two pairs of brown subdermal eyes, arranged in a trapezoid; anterior pair small, rounded; posterior pair large, crescent-shaped ( Fig. 4View FIGURE 4 A) (one specimen lacking eyes). Palps lost. Peristomium short, collar-like, surrounding the prostomium, fused dorsally with large rounded notopodial lamellae of chaetiger 1. Neuropodial postchaetal lamellae of chaetiger 1 moderate, rounded ( Fig. 4View FIGURE 4 E), much smaller than twice the size of the notopodial lamellae.

Four pairs of long branchiae present on chaetigers 2–5 ( Fig. 4View FIGURE 4 A); first pair longer than fourth pair. Pairs 1 and 4 with long, slender, dense digitiform pinnules ( Fig. 4View FIGURE 4 A), arranged along the posterior face of the stems; branchiae with very long, naked, smooth distal tips; basal region of branchiae naked; distribution of the pinnules similar on both pairs; pinnules slender, long, blunt in middle and basal regions of the branchiae ( Fig. 4View FIGURE 4 A); the central stem of branchial pairs 1 and 4 pinnate and elongate. Pairs 2 and 3 apinnate, cirriform, long, with sparse lateral ciliation and acute distal tips ( Fig. 4View FIGURE 4 A); subequal in length, shorter than pinnate pairs and longer than notopodial lamellae.

Notopodial postchaetal lamellae foliaceous and wider on chaetigers 2–6 ( Fig. 4View FIGURE 4 A), slightly cupped and facing somewhat antero-laterally; largest on chaetigers 3–4 with acute, long tips, progressively decreasing in size, becoming rounded on chaetigers 7–10 ( Fig. 4View FIGURE 4 B); decreasing in size in subsequent chaetigers and short on posterior chaetigers ( Fig. 4View FIGURE 4 C). High dorsal crests present on chaetigers 7–9, slightly shorter on chaetiger 8 ( Fig. 4View FIGURE 4 D), subsequent chaetigers lacking folds. Ventral and dorsal edges of notopodial and neuropodial lamellae on anterior chaetiger neither overlapping nor touching. Notopodial prechaetal lamellae fused with postchaetal lamellae; large in branchial region, short thereafter.

Neuropodial postchaetal lamellae rounded throughout ( Fig. 4View FIGURE 4 E, F), except the neuropodium of chaetiger 3 which is slightly angled and trapezium-shaped, dorsally directed ( Fig. 4View FIGURE 4 G), larger than the other neuropodial lamellae; pairs 1–3 cupped and facing somewhat antero-laterally; subsequent neuropodial lamellae small on far posterior chaetigers. Prechaetal lamellae moderate ( Fig. 4View FIGURE 4 E), short throughout. Interparapodial pouches lacking.

All capillaries on anterior chaetigers granulated, unilimbated ( Fig. 4View FIGURE 4 H, I); notopodial and neuropodial capillaries of chaetiger 1 arranged in one row, with short, slender chaetae; notopodial chaetae longer. Notopodial capillaries of chaetigers 2–13 arranged in two rows, very long and very acute ( Fig. 4View FIGURE 4 H), upper chaetae much longer than lower ones, chaetae curving outwards and upwards, becoming shorter later. Neuropodial capillaries of chaetigers 2–10 arranged in two rows, capillaries very long and very acute ( Fig. 4View FIGURE 4 I) with the anterior row shorter than the posterior row, later becoming one row. Notopodial and neuropodial capillaries of middle and posterior chaetigers alimbate and without granulations. Sabre chaetae in neuropodia from chaetiger 10, up to two per fascicle, stout, curved, moderately granulated, without sheaths ( Fig. 4View FIGURE 4 J). Neuropodial hooded hooks ( Fig. 4View FIGURE 4 K) from chaetigers 12–13, up to seven per fascicle, accompanied by capillaries. Notopodial hooded hooks ( Fig. 4View FIGURE 4 L) from chaetigers 26–34, up to five per fascicle, accompanied by up to two capillaries. All hooks with four pairs of teeth above main tooth, with short secondary hoods ( Fig. 4View FIGURE 4 K, L).

Pygidium with one long median cirrus and two longer lateral lobes.

Remarks. The above description agrees closely with the original description given by Foster (1971), however there are a few differences, in that in Foster’s (1971) description the prostomium is subtriangular or wedge-shaped with the anterior border blunt to slightly rounded; all capillaries on the anterior chaetigers are bilimbated; the posterior capillaries are unilimbated and the sabre chaetae are sheathed. Whereas, in the specimens in this study, the prostomium is subtriangular and very rounded anteriorly; all the capillaries are unilimbated and the sabre chaetae lack sheaths. There are also a few differences between the specimens examined in this study and the description given by Johnson (1984) in that in the latter the sabre chaetae are sheathed, whereas in this study the sabre chaetae lacked sheaths. There are a few further differences with the description of this species given by Maciolek (1985) in that Maciolek described the prostomium as having horseshoe-shaped nuchal organs with the anteriormost ends fused over the caruncle, and the sabre chaetae as having sheaths, whereas in this study the specimens have a prostomium with nuchal organs either side of the caruncle and fused above it, and the sabre chaetae lack sheaths. Another discrepancy lies in where the neuropodial and notopodial hooded hooks appear.

According to Foster (1971), the neuropodial and notopodial hooks should be present from chaetigers 11–12 and 21–37, whereas Johnson (1984) states that they begin on chaetigers 10–12 and 26–30, and Maciolek (1985) 10–13 and 21–37. In contrast, the material examined here had neuropodial hooks from chaetigers 12–13 and notopodial hooded hooks from chaetigers 26–34; this could, however, be due to the size of the specimens. The differences between P. cristata  and the other species examined are provided in the key and Table 1.

Geographical distribution. North Atlantic; Delaware, North Carolina, Florida; Gulf of México: Port Aransas, Texas, Veracruz, Yucatán, Caribbean Sea: Quintana Roo, Puerto Rico, Curaçao.

BOR

Guermonprez Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Spionida

Family

Spionidae

Genus

Prionospio

Loc

Prionospio cristata Foster, 1971

Delgado-Blas, Víctor Hugo 2015
2015
Loc

Prionospio cristata

Foster 1971: 87
Loc

Prionospio (Prionospio) cristata:

Maciolek 1985: 340