Cataegis ramosi, Kiel & Aguilar & Kase, 2020

Kiel, Steffen, Aguilar, Yolanda M. & Kase, Tomoki, 2020, Mollusks from Pliocene and Pleistocene seep deposits in Leyte, Philippines, Acta Palaeontologica Polonica 65 (3), pp. 589-627 : 619

Cataegis ramosi sp. nov.

Fig. 32 .

Zoobank LSID: urn:lsid:zoobank.org:act:429B5F94-C73C-4BEA-85A2-19EB3E311F7A

Etymology: In honour of Foracio Ramos (former director of the Philippine Mining and Geoscience Bureau Central Office) for supporting field work in the Philippines.

Type material: Holotype: NMNS PM 28448 . Paratype: NMNS PM 28449 from the type locality; two complete specimens .

Type locality: Liog-Liog Point , Leyte, Philippines .

Type horizon: Upper Pliocene part of the Bata Formation .

Material.— Three specimens from the Pliocene of Liog-Liog : the type material and NMNS PM 28450 (two individuals) .

Dimensions (in mm).—NMNS PM 28448, W = 18.0, H = 17.0; NMNS PM 28449, W = 18.0; H = 16.0.

Diagnosis.—Average-sized Cataegis with four distinct spiral cords per whorl, third spiral forming distinct shoulder; base with two strong spiral cords, one of them forming basal margin, and seven finer, equally strong spiral lines; aperture with apical notch, inner lip callused.

Description.—Trochiform shell with up to five whorls, suture deeply incised; whorls sculptured by four spiral cords, first two thin, closely spaced and close to upper suture, third cord strong, marking whorl’s shoulder, fourth of same strength as third, situated vertically below third close to lower suture; entire whorl surface covered by finely spaced, distinct, oblique growth increments; basal margin marked by two cords of equal strength; base rather straight with seven densely spaced, beaded spiral cords; umbilical slit covered by callus; aperture circular inclined backwards, inner lip callused with groove between umbilical and lip callus.

Remarks.— Kanoia Warén and Rouse, 2016 was separated from Cataegis based on radula characters ( Warén and Rouse 2016), which are typically not preserved in fossils. Based on a comparison of the known species of Kanoia and Cataegis , the latter appears to have a higher, more conical spire whereas the spire of Kanoia appears somewhat dome-shaped (see McLean and Quinn 1987; Fu and Sun 2006, Warén and Rouse 2016; Vilvens 2016). Based on these shell characters we place C. ramosi in Cataegis rather than Kanoia .

The type species C. toreuta differs from C. ramosi by having fewer and stronger spiral cords on the base and a less distinct whorl’s shoulder ( McLean and Quinn 1987). Also C. celebesensis McLean and Quinn, 1987 has fewer spiral cords on the base than C. ramosi . Cataegis leucogranulatus ( Fu and Sun 2006) from the South China Sea has more granular sculpture than C. ramosi and it also has secondary, fine spiral lines between the main spiral cords, a feature not seen in C. ramosi . Among the three species of Cataegis described by Vilvens (2016) from the deep waters around the Solomon Islands, C. stroggile Vilvens, 2016 is most similar to C. ramosi but differs from it by having a more convex whorl profile with three main spiral cords instead of two, and by having fewer spiral lines on the base.

Stratigraphic and geographic range.—Late Pliocene, Leyte, Philippines.

Figures

Fig. 32. The seguenzoid gastropod Cataegis ramosi sp. nov. from the late Pliocene Liog-Liog Point seep deposit in Leyte, Philippines. A. Holotype NMNS PM 28448, in apertural (A1), abapertural (A2), basal (A3), and apical (A4) views. B. Paratype NMNS PM 28449, in abapertural (B1) and apical (B2) views.