Sulawesidrobia dinersteini, Haase & Rintelen & Harting & Marwoto & Glaubrecht, 2023

Haase, Martin, Rintelen, Thomas von, Harting, Britta, Marwoto, Ristiyanti & Glaubrecht, Matthias, 2023, New species from a ‘ lost world’: Sulawesidrobia (Caenogastropoda, Tateidae) from ancient Lake Matano, Sulawesi, Indonesia, European Journal of Taxonomy 864 (1), pp. 77-103 : 93-95

publication ID	https://doi.org/ 10.5852/ejt.2023.864.2089
publication LSID	lsid:zoobank.org:pub:140C7845-6D0F-420F-B88C-390CAE2BC3A7
DOI	https://doi.org/10.5281/zenodo.7845846
persistent identifier	https://treatment.plazi.org/id/5AD928D7-232F-4D7E-AB84-FE9BA9D471F4
taxon LSID	lsid:zoobank.org:act:5AD928D7-232F-4D7E-AB84-FE9BA9D471F4
treatment provided by	Felipe
scientific name	Sulawesidrobia dinersteini
status	sp. nov.

Treatment

Sulawesidrobia dinersteini View in CoL sp. nov.

urn:lsid:zoobank.org:act:5AD928D7-232F-4D7E-AB84-FE9BA9D471F4

Figs 2E View Fig , 3I–J View Fig , 5D View Fig , 6G–H View Fig , 7I–J View Fig , 8H View Fig (all from type locality)

Diagnosis

In the new species, the penis tapering continuously from a broadened base with triangular lobe in about the middle on the right side is unique within the genus. Six diagnostic positions are of type 1 and three of type 3 ( Table 3 View Table 3 ).

Etymology

Sulawesidrobia dinersteini sp. nov. is named after the American conservation biologist Eric Dinerstein (born 1952) for his influential contributions in identifying representative and biologically important ecoregions which help to develop a global safety net aiming to at least protect 30 percent of Earth’s surface in order to save a considerable fraction of biodiversity.

Material examined

Holotype ( Fig. 2E View Fig )

INDONESIA • Sulawesi, Lake Matano , S shore, on rocks and macrophytes; 02°27.850′ S, 121°13.870′ E; 1 Aug. 2004; von Rintelen and Zitzler leg.; MZB Gst. 12124 . GoogleMaps

Paratypes ( Fig. 3I–J View Fig )

INDONESIA • 40 specs; same collection data as for holotype; MZB Gst 12125 GoogleMaps • 38 specs; same collection data as for holotype; ZMB 107092 View Materials GoogleMaps • 11 specs; Sulawesi, Lake Matano , S shore, on rocks and macrophytes; 02°28.461′ S, 121°15.591′ E; 24 Jul. 2004; von Rintelen and Zitzler leg.; MZB Gst 12126 GoogleMaps • 11 specs; same collection data as for preceding; ZMB 107094 View Materials GoogleMaps .

Description

SHELL ( Figs 2E View Fig , 3I–J View Fig ). Short-conical, sutures very shallow, about 1.6 times as high as wide, shell and priostracum light brown; protoconch structure not verified, ca 0.8 whorls; entire shell with 3.500 to 4.250 whorls, teleoconch without structure apart from growth lines; umbilicus a narrow slit; aperture orthocline, only slightly higher than wide.

OPERCULUM. Light yellow and thin, paucispiral, nucleus eccentric.

EXTERNAL FEATURES. Epidermis entirely black except mantle edge, eventually pigment less dense over distal genital glands; tentacles with small, central field of cilia ( Fig. 5D View Fig ).

MANTLE CAVITY (N = 4 from each locality). 16–18 (type locality) and 14–17 (2 nd locality) ctenidial filaments, respectively; osphradium ovate-elongate, underneath middle or slightly behind middle of gill, half to two thirds of length of gill.

DIGESTIVE SYSTEM. The radula has the formula R 3-4 1 3-4/3-4 3-4, L 2 1 2-3, M1 15-20, M2 23-28, central denticle of lateral tooth with rounded tip ( Fig. 6G–H View Fig ); stomach without caecum, without pigment at type locality, pigmented at locality 2; intestine follows pallial genital glands, in females closer than in males.

FEMALE GENITALIA (N = 2 from each locality; Fig. 14I–J). Ovary starts ca 1.25 or slightly more whorls below apex, comprises ca 0.5 whorls, covers stomach chambers; renal oviduct first coiling 180° clockwise, then 270° counter-clockwise; no receptaculum seminis; bursa copulatrix more or less globular, bursal duct enters anteriorly; albumen gland with opaque-white anterior and milky-white posterior section, capsule gland with small opaque white and large yellow posterior portion.

MALE GENITALIA (N = 2 from each locality; Fig. 8H View Fig ). Testis lobate, starts 0.75 (type locality) to 1 whorl (locality 2) below apex, comprises ca 1.25 whorls, covers stomach; vesicula seminalis coils along distal half to 0.75 whorls of testis; vasa deferentia insert close to middle of kidney-shaped prostate, which is much longer (almost twice as long) in locality 2 than at type locality; penis tapering continuously from broadened base, with triangular lobe in about middle on right side, can be considerable longer than in Fig. 8H View Fig , distal end subterminally grey.

Remarks

In the phylogenetic trees, S. dinersteini sp. nov. received high support. Its penis is unique as it is considerably shorter than the similar one of S. megalodon (see Zielske et al. 2011). Some similarity of the radula with that of S. ehrlichi sp. nov. has already been mentioned above. Sulawesidrobia dinersteini had the highest number of diagnostic alignment positions ( Table 3 View Table 3 ) among the new species which clearly reflects the well-supported position in the phylogenetic analyses (see below, Figs 9–10 View Fig View Fig , Supp, file 1).