K. Fraussen & J. Rosado 
Novapex 12(3-4): 73-79, 10 octobre 2011 
The range of Hesperisternia is restricted to East 
Pacific and West Atlantic warm waters (at présent no 
Indo-West Pacific species are known) while 
Micrologie gen. nov. is known from eastern Africa 
which is the other side of the planet). 
For a detailed account on the fossil and recent 
Hesperisternia species we refer to Vermeij (2006: 81- 
82, 89-91). 
Pollia Gray in Sowerby, 1834 (type species: 
Buccimm undosum Linnaeus, 1758: 740) may look 
similar in shape and size, but differs by the spiral 
sculpture consisting of cords of a rather irregular 
strength, the more oval shape with shorter siphonal 
canal and the presence of sculpture on the columella. 
Cancellopollia Vermeij & Bouchet, 1998 (type 
species: Cancellopollia gracilis Vermeij & Bouchet, 
1998: 480-483) differs by the more oval shape and the 
bigger spiral cords of unequal strength. 
Species with a similar columellar callus, for 
example Pollia shepstonensis Tomlin, 1926, 
Buccimm cinis Reeve, 1846 and Triton egregia 
Reeve, 1844, ail of uncertain generic placement (often 
placed in Engina J. E. Gray, 1839 or Prodotia Dali, 
1924), may look similar in size, shape and colour, but 
differ by the broader spiral cords, especially on the 
base and by the presence of knobs or lirae on the 
columella. 
Etymology. Micrologus gen. nov. is named after the 
book “Micrologus”, written in 1026 by Guido 
d’Arezzo and one of the two most popular books 
about music in médiéval times. The musical notation 
(staff notation) introduced in that work is still used 
nowadays. The name refers to the fine spiral fines of 
the shell, which are 5 in nurnber when counting the 
secondary spiral threads and adjacent primary spiral 
cords, which is similar to, and the same nurnber of the 
staff notation. This sculpture is also présent on the 
base of the shell, contrary to other known généra in 
the group, but similar to the ensemble of staffs on a 
score. 
Micrologus mochatinctus sp. nov. 
Figs 1-6 
Type material. Hoiotype, 15.0 mm, Mozambique 
Channel, Almirante Leite Bank, MAINBAZA stn. 
DW3169, 26°H’S, 35°01'E, 450 deep, MNHN- 
23772. 
Paratype 1, 9.5 mm, juvénile (protoconch), same 
locality, MNHN-23773. 
Paratypes 2-5, 13.4-13.8 mm, same locality, MNHN- 
23773, MHNM, JR, KF-6130. 
Type locality. Mozambique Channel, Almirante Leite 
Bank, MAINBAZA stn. DW3169, 26° 11 ’S, 35°01 ’E, 
450 m deep. 
Material examined. Mozambique Channel, 
Almirante Leite Bank, MAINBAZA stn. DW3167, 
26°12’S, 35°02'E, 228-230 m, 5 dd (1 fragment). - 
Stn DW3169, 26°11’S, 35 o 01’E, 450 m, 8 dd (1 juv., 
4 fragments). 
Range and habitat. Only known from Almirante 
Leite Bank. Bathymétrie range, ail empty shells, 
between 228 and 450 m. 
Syntopic with Pollia imprimelatus sp. nov. on both 
DW3167 and DW3169 stations. 
Almirante Leite Bank is an area with strong currents 
overflowing a bottom of hard rocks. The habitat is 
characterized by the presence of rock, coral, sponges 
and gorgonians (Text Fig. 1). 
Description. Shell small (up to 15.0 mm). Shape 
semi-oval, spire fusiform, base slightly stretched. 
Axial sculpture dominant in combination with 
accentuated spiral pattern. Protoconch paucispiral, 
consisting of about I smooth whorl with rather rough 
surface. Transition to teleoconch indistinct, marked by 
a fine incrémental fine and the start of the sculpture of 
the teleoconch. Teleoconch with 5 14 whorls. Colour 
white with brown spiral bands; upper spire whorls 
white, with small brown dots on axial ribs in between 
spiral cords; spiral interspaces of lower spire whorls 
and body whorl omamented with broad, chocolaté 
brown spiral bands, usually darker on axial ribs, 
secondary spiral threads usually brown, primary spiral 
cords snow-white. Narrow band along subsutural 
slope and tip of siphonal canal snow-white. 
First teleoconch whorl with 4 fine spiral cords, 2 
subsutural ones slightly finer, interspaces of equal 
size. Second whorl with 5 primary spiral cords, 
abapical one rather big, gradually decreasing in 
strength towards upper suture, adapical spiral cord 
finer. Third whorl with a single fine secondary spiral 
thread (hoiotype) or cord (paratype 1 ) in the middle of 
each spiral interspace. Spiral interspaces gradually 
becoming broader, at First on periphery; nurnber of 
secondary spiral threads increasing to 3 on fourth 
whorl and body whorl. Spiral sculpture fine, of equal 
strength along the whorl, occasionally slightly higher 
when Crossing axial ribs; primary spiral cords evenly 
spaced also on base, slightly narrower on subsutural 
slope; secondary spiral threads of equal strength. 
First teleoconch whorl with 11 narrow axial ribs; 
abapically slightly weaker or ended, resulting in a 
rather constricted suture; interspaces broad. Axial ribs 
gradually becoming broader, their nurnber slightly 
increasing to 10 on second whorl, 9 on third whorl. 
Penultimate whorl with 11 axial ribs, body whorl with 
13 ribs, including prelabral varix. Axial ribs running 
from suture to just below periphery on body whorl. 
Aperture large, ovate, adapically slightly pinched with 
a single columellar knob and a labral knob bordering 
the anal notch. Columella concave, smooth and 
glossy, with an adapical columellar knob (bordering 
the anal notch) and a strong abapical columellar knob 
on transition to siphonal canal. Callus thin, smooth, 
glossy, broad; abapical part more developed, forming 
a broad layer well adhèrent to columella. Outer lip 
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