Neopsammolyce fragilis, Cruz-Gómez, 2022

Cruz-Gómez, Christopher, 2022, Pelogeniinae Chamberlin, 1919 (Annelida, Sigalionidae) from the Grand Caribbean Region, European Journal of Taxonomy 807, pp. 1-59 : 23-27

publication ID

https://doi.org/10.5852/ejt.2022.807.1717

publication LSID

lsid:zoobank.org:pub:67DAF0D7-9D9F-4F0F-8004-9CCE0071BF33

DOI

http://doi.org/10.5281/zenodo.6421711

persistent identifier

http://treatment.plazi.org/id/03CB87CF-C649-FFB5-B811-FEFEB22BFDA6

treatment provided by

Felipe

scientific name

Neopsammolyce fragilis
status

sp. nov.

Neopsammolyce fragilis   sp. nov.

urn:lsid:zoobank.org:act:1449449F-81B3-4703-A6C7-22FCF62B97A1

Figs 9–10 View Fig View Fig

Diagnosis

A species of Neopsammolyce   with long palps, exceeding segment eleven; with first elytra oval and notched with expanded lobes separated by the notch, and lateral margin convex; second elytra oval with one posterior process; elytra and parapodia with papillae entire; neurochaetae from segment III with blades bifid.

Etymology

The specific name of the species is derived from the Latin singular adjective ‘ fragilis   (-e)’, meaning ‘fragile’ or ‘easily broken’. The name indicates the brittleness and fragility of the elytra, and it is in feminine to match the generic gender ( ICZN 1999, Art. 31.2).

Material examined

Holotype MEXICO • incomplete spec.; Quintana Roo, off Tzucox; 18°58′ N, 87°28′ W; R/V Pillsbury, Stn 604; depth 979 m; 17 Mar. 1967; UMML 22.1088 View Materials . GoogleMaps  

Paratype MEXICO • 1 incomplete spec., 69 segments, 2.9 cm long, 0.9 cm to segment 30, 0.6 cm wide; same collection data as for holotype; UMML 22.1018 View Materials GoogleMaps   .

Other material

MEXICO • 1 incomplete spec., 12 segments, 0.4 cm long, 0.2 cm wide; Yucatán shelf ; 23°30′ N, 88°33′ W; O/V UAT 1 CIDIPORT; depth 57 m; 4 Sep. 2016; Sara B. Balam leg.; ECOSUR-P3224 GoogleMaps   2 incomplete specs, 57–78 segments, 1.4–2.4 cm long, 0.7–1.1 cm to segment 30, 0.2–0.3 cm wide; Yucatán shelf; 21°53′18″ N, 90°31′10″ W; O/V Justo Sierra; depth 49 m; 14 Sep. 2010; Anabel León leg.; ECOSUR-P3225 GoogleMaps   1 incomplete spec., 40 segments, 1.6 cm long, 1.2 cm to segment 30, 0.5 cm wide; Quintana Roo, off Xahuayxol; 18°30′ N, 87°37′ W; R/V Pillsbury, Stn 607; depth 751 m; 17 Mar. 1967; UMML 6802-607 View Materials GoogleMaps   .

UNITED STATES OF AMERICA • 1 incomplete spec., 42 segments, 3.2 cm long, 1.4 cm to segment 30, 0.6 cm wide; Florida; 24°40′ N, 80°04′ W; R/V Gerda, Stn 226; depth 803 m; 23 Jan. 1964; UMML 6402-226 View Materials GoogleMaps   .

Description (holotype)

BODY. Pale yellow, cylindrical, broad ( Fig. 9A–B View Fig ); 47 segments, 2 cm long, 1.2 cm to segment 30, 0.6 cm wide. Middorsal line covered with white foreign particles and foraminifera attached to adhesive papillae ( Fig. 9F View Fig ). Venter covered with short bulbous and long dendritic papillae ( Fig. 9G View Fig ).

PROSTOMIUM. Spherical. Two pairs of poorly defined eyes, anterior eyes larger, covered by the median antenna ceratophore. Lateral antennae short, bulbous; ceratophores as long as styles, dorsally fused with tentacular segment, covered by median antennal ceratophore ( Fig. 9E View Fig ). Median antenna with tapered ceratophore, slightly longer than prostomium, with dorsal ridges; style short, as long as prostomium ( Fig. 9B–C View Fig ). Middorsal lobe of segment II with a longitudinal ridge. Facial tubercle short, visible between palps ( Fig. 9D View Fig ). First segment directed anteriorly; fused with tentacular segment; biramous, chaetae simple verticillate. Dorsal tentacular cirrus longer than neuropodia including chaetae, ventral

tentacular cirrus shorter than dorsal one; palps long, reaching segment 11, with inner palpal sheaths ( Fig. 9D View Fig ).

ELYTRA. First right elytron subtriangular deeply notched, covered with foraminifera and coarse sand ( Fig. 10F View Fig ), two kinds of papillae: flat papillae, and pedunculate papillae with flat tips, more abundant in elytral center; elytral margins with short dendritic papillae ( Fig. 10J–K View Fig ). Second right elytron oval notched, with one posterior process ( Fig. 10G View Fig ), same kinds of papillae on elytral surface, elytral margin with short and long dendritic papillae ( Fig. 10I View Fig ). Posterior elytra oval with one medial process ( Fig. 10H View Fig ), same kinds of papillae on elytral surface, elytral margin with short dendritic papillae. All elytra very brittle.

RIGHT PARAPODIUM FROM SEGMENT II ( Fig. 9H View Fig ). Notopodia conical, papillate, short, half as long as neuropodia, notopodial flange leaf-shaped. With up to 70 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones 4× as long ( Fig. 9I View Fig ). Neuropodia conical, papillate and larger than notopodia. Neurochaetae only falcigers, most blades falcate, bifid: unit A, two falcigers with handles slender with 8–9 transverse rows of spines, blades long, 28–30 × as long as wide ( Fig. 9J View Fig ); unit B, four falcigers with handles thick with 41–48 barely perceptible transverse rows of denticles, blades long 21– 23 × as long as wide ( Fig. 9K View Fig ); unit C, six falcigers with handles slender with 30–34 barely perceptible transverse rows of denticles, blades soft, long, 40 × as long as wide ( Fig. 9L View Fig ); unit D, four falcigers with handles slender with 8–10 barely perceptible transverse rows of denticles, blades long, 10–12 × as long as wide ( Fig. 9M View Fig ).

RIGHT PARAPODIUM FROM SEGMENT III ( Fig. 9N View Fig ). Notopodia conical, short, papillate, ⅓ as long neuropodia, notopodial flange leaf-shaped. With up to 80 simple verticillate notochaetae, shortest ones as long as notopodia, longest ones twice as long ( Fig. 9O View Fig ). Neuropodia truncated, papillate, larger than notopodia. Neurochaetae only bifid falcigers: unit A, two falcigers with handles slender with 9–10 transverse rows of spines, blades long, 19 × as long as wide ( Fig. 9P View Fig ); unit B, three falcigers with handles thick with 8–12 barely perceptible transverse row of denticles, blades long, 9× as long as wide ( Fig. 9Q View Fig ); unit C, 10 falcigers with handles slender, smooth, blades long, 28–30× as long as wide ( Fig. 9R View Fig ); subunit 1, two falcigers with handles thick, smooth, blades long, 8–10 × as long as wide ( Fig. 9S View Fig ); unit D, six falcigers with handles slender, smooth, blades long, 25 × as long as wide ( Fig. 9T View Fig ).

RIGHT PARAPODIUM FROM SEGMENT 31 (MIDDLE SEGMENT) ( Figs 9U View Fig , 10A View Fig ). Notopodia conical, smooth (nonpapillate), short, ⅓ as long as notopodia; notopodial flange bulbous. With up to 50 simple verticillate notochaetae, shortest ones twice as long as notopodia, longest ones 3× as long ( Figs 9V View Fig , 10B View Fig ). Neuropodia truncated, papillate, larger than notopodia. Neurochaetae only bifid falcigers: unit A, two falcigers with handles thick, barely noticeable 2 rows of denticles, blades long, 9–10 × as long as wide ( Fig. 9W View Fig ); unit B, two falcigers with handles thick, smooth, blades lost (posterior segment, blades medium-sized, 5–6 × as long as wide) ( Figs 9X View Fig , 10C View Fig ); unit C, six falcigers with handles thick, smooth, blades short, 4 × as long as wide ( Figs 9Y View Fig , 10C View Fig ); subunit 1, two falcigers with handles slender, smooth, blades mediumsized, 6× as long as wide ( Figs 9Z View Fig , 10E View Fig ); unit D, four falcigers with handles slender, smooth, blades short, 4× as long as wide ( Fig. 9 View Fig AA).

POSTERIOR REGION. Lost.

Remarks

Neopsammolyce fragilis   sp. nov. resembles N. occidentalis ( McIntosh, 1885)   as described and illustrated by Pettibone (1997), in having long palps, first elytra notched, notopodia reduced, and neuropodia highly papillate. However, both species differ in the shape of the first and second elytra, and the neurochaetae from segment III. Specimens of N. fragilis   sp. nov. have an oval and notched first elytra with two expanded

lobes, and lateral margin convex; an oval second elytra with a posterior process, and neurochaetae from segment III with blades bifid; whereas specimens of N. occidentalis   have first elytra subrectangular and notched with two narrow lobes, and a concave lateral margin ( Pettibone 1997: 14, fig. 8d); an oval second elytra, notched, without processes ( Pettibone 1997: 14, fig. 8e), and neurochaetae from segment III with blades bifid and entire ( Pettibone 1997: 13, fig. 7f).

Distribution

Gulf of Mexico. From Florida to Quintana Roo.