Dianajonesia excavatum (Hoek, 1907)

Pitriana, Pipit, Jones, Diana S., Corbari, Laure & Rintelen, Kristina von, 2020, New insights gained from museum collections: Deep-sea barnacles (Crustacea, Cirripedia, Thoracica) in the Museum National d'Histoire Naturelle, Paris, collected during the Karubar expedition in 1991, Zoosystematics and Evolution 96 (2), pp. 649-698 : 649

Dianajonesia excavatum (Hoek, 1907) Figure 5

Poecilasma excavatum Hoek, 1907: 10, pl. I, figs 5-10.

Poecilasma tridens . - Weltner 1922: 80, pl. 4, fig. 19 (non Aurivillius).

Poecilasma (Temnaspis) excavatum . - Nilsson-Cantell 1925: 16, fig. 5, pl. 1, fig. 1.

Trilasmis (Temnaspis) excavatum . - Hiro 1937b: 412.

Dichelaspis (Dichelaspis) tridens . - Stubbings 1936: 7, fig. 2. (non Aurivillius).

Trilasmis excavatum . - Nilsson-Cantell 1938: 9.

Temnaspis excavatum . - Broch 1931: 31, fig. 10. - Dong et al. 1982: 77.

Dianajonesia excavatum . - Koçak & Kemal, 2008: 2.

Material examined.

- Tanimbar Island: 3 specimens, MNHN-IU-2019-4859, Stn. CP 78, 09°06'S, 131°24'E, 284-295 m depth, 3 November 1991.

Diagnosis.

Capitulum with scutum divided into two segments parallel to occludent margin; tergum with excavation in scutal margin near occludent margin, receiving tip of occludent segment of scutum.

Description.

Capitulum oval, apex pointed, slightly thick, swollen. Scutum with larger segment strongly bowed, basal margin short, apex pointed; smaller segment bowed, terminating in point at base, tergal margin rounded, fitting exactly into excavation of tergum. Tergum triangular, characteristic excavation at scutal margin near occludent margin. Carina narrow, terminating in spatula-shaped disc. Cirrus I with anterior and posterior rami subequal (each five-segmented); cirri II-VI longer, more slender; cirrus VI with caudal appendages. Penis thick, ringed, especially mid-length, terminating in narrower, curved part. Maxillule notched, two large teeth on upper side; mandible with four teeth, largedistance between first and second teeth. Labrum convex, with numerous blunt teeth. Measurements of specimen: basal diameter of capitulum 1.06 mm; capitular height 7.12 mm; total height 12.69 mm; scutal width 3.08 mm; scutal length 6.09 mm; tergal width 1.30 mm; tergal length 3.47 mm.

Distribution.

Indo-west Pacific: East coast of Africa (Zanzibar); Gulf of Aden; Indonesia; Malay Archipelago; South China Sea; East China Sea; Philippines; South Japan (Goto Island); attached to echinoid spines, crustaceans; palinurids and cirripedes; 189-600 m depth ( Jones and Hosie 2016). In this study, Dianajonesia excavatum was found at Tanimbar Island, Indonesia.

Type locality.

Siboga station 253; 5°48.2'S, 132°15'E; depth: 304 m; bottom: grey clay, hard and crumbly ( Hoek 1907).

Figures

Figure 5. Dianajonesia excavatum (Hoek, 1907) (MNHN-IU- 2019 - 4859). a. left lateral view showing the capitulum and peduncle; b. right lateral view showing the capitulum and peduncle; c. anterior view, orifice; d. posterior view, carina. Scale bar: 2 mm (a-d).