Godzilliognomus schrami, Iliffe, Thomas M., Otten, Tina & Koenemann, Stefan, 2010

Iliffe, Thomas M., Otten, Tina & Koenemann, Stefan, 2010, Godzilliognomus schrami, a new species of Remipedia (Crustacea) from Eleuthera, Bahamas, Zootaxa 2491, pp. 61-68 : 62-67

publication ID	https://doi.org/ 10.5281/zenodo.195641
DOI	https://doi.org/10.5281/zenodo.6207155
persistent identifier	https://treatment.plazi.org/id/039F866B-FF89-FFE3-FF55-F9FBFEFFFEEB
treatment provided by	Plazi
scientific name	Godzilliognomus schrami
status	sp. nov.

Treatment

Godzilliognomus schrami View in CoL , new species

( Figs. 2–5 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Type locality: Windermere Abyss, Eleuthera, Bahamas.

Material examined: Eleven specimens, including a 7.9 mm holotype and ten paratypes, were collected from the type locality on August 24, 2007 by Thomas M. Iliffe. All specimens with 16 trunk segments. Paratypes 1–3 (7.4 mm, 6.8 mm, and 7.3 mm, respectively) were dissected for examination and preserved in glycerine (retained in research collection of SK). Paratypes 4–10 (5.6 to 7.2 mm; ZMB 27739) and the holotype ( ZMB 27739), all preserved in alcohol as whole specimens, were deposited at the Museum für Naturkunde, Berlin ( ZMB).

Etymology: In honor of Professor Emeritus Frederick R. Schram, formerly of the San Diego Natural History Museum and the Zoological Museum of the University of Amsterdam, the epithet schrami has been chosen. Professor Schram is renowned for his contributions to crustacean biology, including Remipedia.

Diagnosis: A very small-sized and slender species, body length up to 8 mm, adult specimens composed of 16 trunk segments; dorsal ramus of antennule 10-segmented, ventral flagellum with 2 segments; maxilla and maxilliped robust, pseudochelate, distal segments partly fused, very narrow; claw of maxilla and maxilliped composed of 5 denticles; anal segment longer than wide; caudal rami reaching approximately 75% of length of anal segment.

Description: Based on holotype and paratypes. Body small with a maximum length of 8 mm and 16 trunk segments ( Fig. 2 View FIGURE 2 ). Sternal bars isomorphic. Pleural tergites comparatively narrow, with acuminate posterolateral corners, becoming more angular in posterior part of trunk ( Fig. 3 View FIGURE 3 A). Cephalic shield with convex lateral margins at insertion of antennule, approximately as long as trunk segments 1–3 ( Fig. 3 View FIGURE 3 A). First trunk segment very narrow, partly covered by head shield. Frontal filaments ( Fig. 4 View FIGURE 4 C) long, cylindrical, with slender distomedial process being approximately half as long as main filament, ending below tip of main filament.

Antennule ( Fig. 4 View FIGURE 4 A): Peduncle bears few aesthetascs. Dorsal ramus 10-segmented, reaching up to 2/3 of length of body. Ventral flagellum 2-segmented, reaching 1/7 of length of dorsal ramus.

Antenna ( Fig. 4 View FIGURE 4 B): Proximal segment of protopod with about 4 marginal setae; distal segment with ca. 8 marginal setae. Exopod with oval shape, approximately as long and wide as adjacent distal segment of protopod, bearing about 16 long setae. Endopod slightly bent, 3-segmented; first two proximal segments with about 6 and 4 setae, respectively; distal segment with 10 setae. All setae plumose.

Mandible ( Fig. 4 View FIGURE 4 E–G): Molar process slightly oval; bearing dense plumose setae. Left incisor process with four large denticles; left lacinia mobilis slightly crescent-shaped. Right incisor process and lacinia mobilis with three large denticles.

Labrum ( Fig. 4 View FIGURE 4 D): Bearing a distinct median, and two smaller lateral clusters of fine setules on apical margin.

Maxillule ( Fig. 5 View FIGURE 5 A): Segment 1 with slender endite, bearing 7 stout setae on distal margin, two of which serrated ( Fig. 5 View FIGURE 5 D). Second segment with spatulate, broad endite, with several setae of unequal length and short stout setae along apical and subapical margins. Segment 3 short; without endite; bearing 1–2 short setae. Segment 4 (lacertus) robust, bearing two rows of about 8 setae, respectively. Segment 5 shorter than lacertus. Sixth segment very short, with two distomedial clusters of long, slender setae. Claw long, about 3–4 times longer than sixth segment.

Maxilla ( Fig. 5 View FIGURE 5 B): Robust, pseudochelate, distal segments partly fused. Segment 1 with 3 endites, each with 1 prominent apical stout seta accompanied by several short and medium-long, naked setae along subapical margins. Endite of second segment rounded, bearing 2 long setae. Segment 3 (lacertus) robust, medial margin expanded, with dense rows of long and short plumose setae ( Fig. 5 View FIGURE 5 E). Segments 4–6 of brachium fused, very narrow, bearing medial rows of foliaceous setae ( Fig. 5 View FIGURE 5 F). Division between fourth segment and adjacent distal part of brachium weakly defined. Claw with 5 acuminate denticles and thumb-like pad bearing a few apical setae ( Fig. 5 View FIGURE 5 G).

Maxilliped ( Fig. 5 View FIGURE 5 C): Robust, similar to maxilla, but more slender. Suture between proximal segments indistinct. Segment 1-3 with short, rounded endites bearing several setae. Segment 4 (lacertus) robust, medial surface with dense rows of plumose setae and simple setae of unequal length. Brachium very narrow, bearing medial rows of foliaceous setae, distal part naked; segments 5–8 fused. Claw similar to that of maxilla.

Trunk appendages ( Fig. 3 View FIGURE 3 B, C): Becoming smaller and less setose posteriorly. Endopod of first trunk appendage ( Fig. 3 View FIGURE 3 B) small; segments 2 and 3 with a few long setae along lateral margins; segment 4 with long setae along lateral and apical margins. Exopod almost 1.3 times longer than endopod; segments bearing long setae along lateral and medial margins. Trunk appendages of seventh trunk somite ( Fig. 3 View FIGURE 3 C) robust, large.

First segment of endopod with single spine-like plumose seta on distolateral corner ( Fig. 3 View FIGURE 3 E); segments 2–4 bearing long setae along lateral and/or medial margins; segment 3 with single spine-like serrate seta on distolateral margin ( Fig. 3 View FIGURE 3 D). Exopod slightly longer than endopod; first segment with several lateral setae; segments 2-3 with long setae along lateral and medial margins. All long and slender setae on trunk limbs plumose.