Platytyphlops orbicularis ( Calman, 1905 )

Roccatagliata, D., 2023, The genus Platytyphlops (Cumacea: Crustacea): A new species from Argentina, taxonomic status of Platytyphlops orbicularis (Calman, 1905), and remarks on the genus, Zoologischer Anzeiger 302, pp. 284-292 : 289-290

publication ID

https://doi.org/ 10.1016/j.jcz.2022.12.008

DOI

https://doi.org/10.5281/zenodo.14056562

persistent identifier

https://treatment.plazi.org/id/03BEE33B-FFA2-FFA2-FF49-9DC708D2E2AB

treatment provided by

Felipe

scientific name

Platytyphlops orbicularis ( Calman, 1905 )
status

 

Platytyphlops orbicularis ( Calman, 1905) View in CoL

Figs. 7 View Fig , 8C–E View Fig

Platyaspis orbicularis Calman, 1905: 43 , Figs. 77–81.

Platytyphlops orbicularis — Stebbing, 1912: 144, 161 (in part); 1913: 158, 159 (in part, catalog). — Zimmer, 1980: 18 (in part). — Gerken, 2018: 139 (key), 145, 158, 181 (in part).

Platysympus orbicularis — Hansen, 1920: 52.

Paralamprops orbicularis — Reyss, 1978a: 12 [“Sta. 44, 1 specimen ”, Biscay Bay, RV Sarsia]. — Day, 1978: 148 (in part, key). — B˘acescu, 1988: 25 (in part, catalog). — Jones, 1990: 78, 80 (tables). — Gerken and Watling, 1999: 203, 204. — Watling and Gerken, 2005: 139 (table).

3.2. Material examined

THALASSA 70, Sta. W357, 43 ◦ 37 ′ N, 02 ◦ 19.2 ′ W, 770 m, 04 Oct 1970: 3 SA ♀♀, 2 A ƋƋ, 1 SA Ƌ ( MACN-In. 44073 ) GoogleMaps . BIOGAS II, Sta. DS33, 47 ◦ 39.7 ′ N, 08 ◦ 05.5 ′ W, 2338 m, 20 Apr 1973: 1 juv. ( MACN-In. 44074 ) GoogleMaps .

3.2.1. Description of the adult male (habitus and appendages description are based on specimens MACN-In. 44073a and MACN-In. 44073b)

Total length: 8.2 mm.

Carapace ( Figs. 7A View Fig and 8C, D View Fig ) dorso-ventrally flattened; approximately as long as wide, broadly rounded anteriorly. With a marginal carina; a double mid-dorsal carina runs from anterior margin of frontal lobe to anterior end of a wide median gutter; a pair of submedian carinae at each side of the wide median depression, which extends almost to posterior margin (these carinae become more evident when the specimen is inclined, see Fig. 8D View Fig ). Marginal carina without teeth. Pseudorostral lobe longer than ocular lobe, with a median notch (visible in dorsal view). Ocular lobe triangular, no lenses. Frontal lobe not interrupted dorsally, i.e., ocular lobe separated from frontal lobe by frontal suture.

Free thoracic segments ( Fig. 7A View Fig ) 0.7 as long as carapace.

Abdomen very long, without carinae, 1.33 times as long as cephalothorax.

Pleonites 1–5 increasing in length backwards. Pleonite 6 1.52 times longer than wide.

Telson ( Fig. 7D View Fig ). 1.54 times as long as pleonite 6.

First antenna ( Fig. 7B View Fig ). Peduncle, article 1 1.33 times as long as articles 2 and 3 together. Article 2 1.69 times article 3. All three articles with many setulate setae. Main flagellum shorter than peduncle, composed of 5 articles, article 1 thicker and with a large number of aesthetascs (2 of them fully drawn, remaining ones cut basally), article 4 with an aesthetasc distally; article 5 minute, with an aesthetasc halfway along article. Accessory flagellum 0.9 as long as main flagellum, composed of 4 articles, last one minute.

Fifth pereopod ( Fig. 7C View Fig ) minute, without setae (except for dactylus distal seta), slightly longer than half its pereonite, approximately 0.25 as long as basis of pereopod 4. All articles distinct.

Uropod ( Fig. 7D View Fig ). Peduncle 1.71 times as long as telson, inner margin with approximately 30 robust setae (only the seta socket usually remains). Rami broken.

Penial papillae ( Fig. 7C View Fig ), without setae or elaboration, extending from the genital pores.

3.2.2. Description of the subadult female (habitus based on specimen MACN-In. 44073c and MACN-In. 44073d)

Total length: 9.6 mm.

Carapace ( Fig. 7E View Fig ) as adult male, except for nearly circular in dorsal view, 1.08 times wider than long. Middorsal carina single, finely denticulated (with microscopic teeth only visible under high magnification).

Fifth pereopod ( Fig. 8E View Fig ), even shorter than in the male, without setae (except for dactylus distal seta), less than 0.5 as long as its pereonite, approximately 0.2 as long as basis of pereopod 4. All articles distinct.

The poor condition of the specimens prevents further description.

3.2.3. Distribution

North-East Atlantic, 423–2338 m (see Fig. 1 View Fig , Table 1 View Table 1 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Cumacea

Family

Lampropidae

Genus

Platytyphlops

Loc

Platytyphlops orbicularis ( Calman, 1905 )

Roccatagliata, D. 2023
2023
Loc

Platyaspis orbicularis

Calman 1905: 43
1905
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